LEXUS GS400 2000 Service Repair Manual

R12076Airbag Sensor AssemblyDisconnection
Detection
PinSRS
Warning
Light
H00955
Terminal for Diagnosis
Disconnection Detection Pin
Half Connection
Complete Connection
Terminal for
Diagnosis
RS±6
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2237 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HINT:
The type of connector shown on the previous page is used for
the spiral cable connector º5º on the airbag sensor assembly
side.
(3) Electrical Connection Check Mechanism
This mechanism electrically checks that connectors
are connected correctly and completely. The electri-
cal connection check mechanism is designed so
that the disconnection detection pin connects with
the diagnosis terminals when the connector hous-
ing lock is locked.
HINT:
The above illustration shows connectors º1º, º2º and º3º.

AB0089
Secondary Lock
Primary LockLockLock
Primary Lock Incomplete
(Secondary Lock Prevented)Primary Lock Complete
(Secondary Lock Permitted)Twin±Lock Completed
Z14034
Fig.1
Fig.2Power Source
Safing
Sensor
Squibs
Airbag Sensor
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±7
2238 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(4) Connector Twin±Lock Mechanism
With this mechanism connectors (male and female
connectors) are locked by 2 locking devices to in-
crease the connection reliability. If the primary lock
is incomplete, ribs interfere and prevent the sec-
ondary lock.
(b) When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than the pre-
determined level, the SRS is activated automatically. A
safing sensor is designed to go on at a smaller decelera-
tion rate than the airbag sensor. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which
happens when a safing sensor and the airbag sensor go
on simultaneously. When a deceleration force acts on the
sensors, 2 squibs in the driver airbag and front passenger
airbag ignite and generate gas. The gas discharging into
the driver airbag and front passenger airbag rapidly in-
creases the pressure inside the bags, breaking open the
steering wheel pad and instrument panel door.
Bag inflation then ends, and the bags deflate as the gas
is discharged through discharge holes at the bag's rear or
side.

H01581
Outer
H01582
Lock of connector is released
Disconnection is completed
H01583
Outer
Outer
RS±8
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2239 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
11. DISCONNECTION OF AIRBAG SENSOR CONNEC-
TOR
(a) With holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.
(b) When lock of the connectors is released disconnect the
connector.
HINT:
Make sure to hold both flank sides of the outer. If holding the top
and bottom sides, it obstructs disconnection.
12. CONNECTION OF AIRBAG SENSOR CONNECTOR
(a) Align the male connector (on the side of sensor) and fe-
male connector in the same direction as shown in the il-
lustration and fit in them without rubbing.
(b) As they are fitted in, the outer slides rearward. Press it un-
til the outer returns to its original position again.
If fitting stops on the half way, connectors will separate.
(c) Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)
HINT:
Do not fit in with holding the outer.
When fitting in, the outer slides. Do not touch it.

H01584
Slider
Disconnection is completed Slider
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±9
2240 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
13. DISCONNECTION OF SIDE AIRBAG CONNECTOR
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.

H01585
SliderSlider
RS±10
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2241 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
14. CONNECTION OF SIDE AIRBAG CONNECTOR
(a) Align the male connector and the female connector in the
same direction as shown in the illustration, fit in them with-
out rubbing.
(b) Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)
HINT:
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.

H01586
Slider
Disconnection is completed Slider
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±11
2242 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
15. DISCONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.

H01587
SliderSlider
RS±12
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2243 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
16. CONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Align the male connector and the female connector in the
same direction as shown in the illustration, fit in them with-
out rubbing.
(b) Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)
HINT:
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.

RS08B±01
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
RS±25
2256 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
REPLACEMENT REQUIREMENTS
In the following case, replace the steering wheel pad, steering wheel or spiral cable.

If the airbag has been deployed.

If the steering wheel pad or spiral cable has been found to be faulty in troubleshooting.

If the steering wheel pad, steering or spiral cable has been found to be faulty during the check
in items (See page RS±15).

If the steering wheel pad has been dropped.
CAUTION:
For removal and installation of the steering wheel pad, see page SR±11 and SR±17. Be sure to follow
the correct procedure.

RS08C±01
RS±26
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
2257 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
INSTALL STEERING WHEEL AND SPIRAL CABLE (See page SR±17)

RS07D±01
H02588
Instrument Panel
Front Passenger
Airbag Assembly
5.6 (57, 49 in.´lbf)
: Specified torqueN´m (kgf´cm, ft´lbf)
± SUPPLEMENTAL RESTRAINT SYSTEMFRONT PASSENGER AIRBAG ASSEMBLY
RS±27
2258 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FRONT PASSENGER AIRBAG ASSEMBLY
COMPONENTS